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Re: [Bacula-users] Faster reading of Volumes from disk
2016-02-17 18:13:32
On Tue, 16 Feb 2016 18:59:10 -0500, Dan Langille said:
As a test, I scp'd over all the volumes for one job and timed it:
real 167m15.956s
user 117m51.006s
sys 23m56.653s
FWIW, these copies were done while a ZFS scrub was underway, so if anything, the potential throughput is higher.
The job above, took nearly 11 hours. Something is up.
I tried another test run, just now, but cancelled it after the first two Volumes were read; it was going at about the same rate as the full job mentioned above.
What might account for this vast difference?
You could try profiling it, e.g http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html#DTrace
This is a great idea. Have you done this before? I haven't and my first attempt seems to be interesting.
It didn't run very long, and thus I'm not sure how relevant the information is
-- Dan Langille - BSDCan / PGCon
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